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    • 21. 发明授权
    • Line shunt and ground fault apparatus method
    • 线路分流和接地故障装置方法
    • US06292541B1
    • 2001-09-18
    • US09189393
    • 1998-11-10
    • Lee D. TiceRobert J. ClowManley S. Keeler
    • Lee D. TiceRobert J. ClowManley S. Keeler
    • H04M124
    • H04B3/46
    • A system and method to detect ground faults in a multi-processor communication system that includes a communications link that extends between the processors. The processors isolate different sections of the link. Measurements made with different isolated sections establish the location of the fault. The processors can also make measurements of the link to establish the magnitude of a shunt impedance on the link. Where an abnormal value of shunt impedance is detected, the respective devices can activate or deactivate solid state isolation circuitry to disconnect a section of the link exhibiting the abnormal level of shunt impedance.
    • 一种在多处理器通信系统中检测接地故障的系统和方法,其包括在处理器之间延伸的通信链路。 处理器隔离链接的不同部分。 用不同隔离部分进行的测量确定了故障的位置。 处理器还可以对链路进行测量,以建立链路上并联阻抗的大小。 在检测到并联阻抗的异常值的情况下,相应的器件可以激活或去激活固态隔离电路以断开呈现异常分流阻抗水平的链路的一部分。
    • 23. 发明授权
    • Fire alarm system with different types of sensors and dynamic system
parameters
    • 火灾报警系统具有不同类型的传感器和动态系统参数
    • US5557262A
    • 1996-09-17
    • US479957
    • 1995-06-07
    • Lee D. Tice
    • Lee D. Tice
    • G08B25/00G08B17/00G08B26/00G08B29/18G08B17/06G08B17/10
    • G08B17/00G08B26/002
    • A fire alarm system utilizes outputs from different types of fire sensors, such as photoelectric smoke sensors or ionization type smoke sensors and combines those outputs by subtraction so as to establish a delay interval during which one or both of the sensor output values must exceed a predetermined threshold value to cause the system to go into an alarm condition. Prior to subtracting the outputs from one another, each of the outputs can be raised to a predetermined exponential value so as to emphasize the effects of larger sensor output values. Where the two types of fire sensors each are generating outputs indicative of a fire condition, the calculated delays will be relatively short. In instances where only one of the two sensors is generating an output indicative of a fire condition, the calculated delay will be longer, so as to inhibit false alarms.
    • 火灾报警系统利用来自不同类型的火灾传感器(例如光电烟雾传感器或电离式烟雾传感器)的输出,并通过减法组合这些输出,以建立一个或两个传感器输出值必须超过预定的延迟间隔 阈值使系统进入报警状态。 在从彼此减去输出之前,可以将每个输出升高到预定的指数值,以便强调较大的传感器输出值的影响。 在两种类型的火灾传感器各自产生指示火情的输出的情况下,所计算的延迟将相对较短。 在两个传感器中只有一个生成表示火情的输出的情况下,所计算的延迟将更长,从而抑制虚警。
    • 24. 发明授权
    • Multiple sensor apparatus and method
    • 多传感器装置及方法
    • US5483222A
    • 1996-01-09
    • US153130
    • 1993-11-15
    • Lee D. Tice
    • Lee D. Tice
    • G08B17/10G08B29/18G08B19/00
    • G08B29/188G08B17/10
    • An alarm system which incorporates a large number of ambient condition sensors makes a determination as to the existence of a predetermined alarm condition by detecting respective ambient conditions from each member of a group of sensors. The indicators from the plurality of sensors are each raised to a respective predetermined exponent and summed together. The resultant sum is compared to a predetermined threshold to determine whether or not the alarm condition is present. The detectors can be spaced apart from one another in a selected region and coupled to a central control unit by a bi-directional communications link. Running averages of sums can be formed to provide filtering or smoothing or trend analysis.
    • 包含大量环境条件传感器的报警系统通过检测来自一组传感器的每个构件的相应环境条件来确定是否存在预定的报警状况。 来自多个传感器的指示器各自被升高到相应的预定指数并且相加在一起。 将所得到的和与预定阈值进行比较,以确定是否存在报警条件。 检测器可以在所选择的区域中彼此间隔开并且通过双向通信链路耦合到中央控制单元。 可以形成总和的运行平均值,以提供过滤或平滑或趋势分析。
    • 25. 发明授权
    • Smoke and fire detection system communication
    • 烟火探测系统通讯
    • US4916432A
    • 1990-04-10
    • US111811
    • 1987-10-21
    • Lee D. TiceTodd W. FritzMark A. Kilcommons
    • Lee D. TiceTodd W. FritzMark A. Kilcommons
    • G08B26/00H04Q9/14
    • G08B26/002H04Q9/14
    • A smoke and fire detection system wherein a central controller transmits data to remote transponders on a voltage supply line by pulse code modulation (PCM) of the supply voltage, and the transponders communicate with the controller by pulse width modulated (PWM) current pulses over the voltage supply line. A transmitter in the controller supplys a nominal operating voltage to the transponders and transmits a data word comprising a plurality of data bits to the transponders over the line. The transmitter generates each data bit by switching the voltage supplied to the line from the nominal operating voltage to a first voltage corresponding to a first logical level or a second voltage corresponding to a second logical level. A decoder in each transponder derives the transmitted data word. The decoder detects each data bit by detecting the transition from the nominal voltage to the first or second voltages, and the decoder determines the logical level of each bit by measuring the transmitted voltage level immediately after detecting the transition. The transponder returns data to the controller in the form of data signals, each data signal having a duration based on the data to be returned. With such arrangement, the transponders do not require a clock or other timing circuitry to communicate with the controller. Also, the controller may vary the data rate or bit duration without interfering with the operation of the transponders.
    • 一种烟雾和火灾探测系统,其中中央控制器通过电源电压的脉冲编码调制(PCM)将数据发送到电压供应线路上的远程转发器,并且应答器通过脉冲宽度调制(PWM)电流脉冲与控制器通信 电源线。 控制器中的发射器向转发器提供额定工作电压,并将包含多个数据位的数据字通过线路发送到应答器。 发射机通过将从标称工作电压提供给线路的电压切换到对应于第一逻辑电平的第一电压或对应于第二逻辑电平的第二电压来产生每个数据位。 每个转发器中的解码器导出所发送的数据字。 解码器通过检测从标称电压到第一或第二电压的转变来检测每个数据位,并且解码器通过在检测到转换之后立即测量发送的电压电平来确定每个位的逻辑电平。 应答器以数据信号的形式将数据返回给控制器,每个数据信号具有基于要返回的数据的持续时间。 通过这样的布置,应答器不需要时钟或其他定时电路来与控制器通信。 此外,控制器可以改变数据速率或位持续时间,而不会干扰应答器的操作。